Public bug reported:
[Ubuntu 10.04 LTS kernel through upstream kernel version 2.6.34-rc6]
Kernel boot param "acpi_backlight=video" does not enable backlight
support as intended. Setting it actually ends up enabling the video
output switching feature (the same as "acpi_display_output=video" does).
It is not possible to force backlight support, since no code ever
enables ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Kamal Mostafa (kamalmostafa)
Status: In Progress
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Kamal Mostafa (kamalmostafa)
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acpi_backlight=video does not work
https://bugs.launchpad.net/bugs/573120
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